)for a certain reaction, kc=0.514 and kf=38.2 m^-2 x s^-1 . calculate the value of the reverse rate constant, kr, given that the reverse reaction is of the same molecularity as the forward reaction.
express your answer with the appropriate units.

part b)

for a different reaction, kc=1.28×10^3 , kf=1.77×10^3 s^-1 , and kr=1.38 s^-1 . adding a catalyst increases the forward rate constant to 7.47×10^5 s^-1. what is the new value of the reverse reaction constant, k_r, after adding catalyst?
express your answer with the appropriate units.